Question about 2003 Volkswagen Passat

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I've got oil in my coolant water on volkswagen 2001 passat, 1.8. I took the oil cooler off and attempted to test it using home water pressure; did not detect leak.

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  • rdaservicing
    rdaservicing May 11, 2010

    Recommend flush the oil cooler with diesel to remove the water that will reside after your leak test, then flush the cooling system with clean water, re-fill all, run the car for a while if you continue to get a build up of oil scum in the cooling system it may suggest the cylinder head has fractured or the head gasket has blown. If you find this advice helpful please rate.

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YOu may have to take it to a mechanic as the seals may need to warm up for the seals to expand and detect a leak

Posted on Jul 08, 2009

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Hi, i have automatic passat 1999 model and recently water happens to get into the gear box and it control board, i experiences a boom sound anytime the gear is changed, the oil has been changed by the...


If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

tdisline_495.jpg
The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

tdisline_496.jpg
In the picture above the transmission oil pan was removed for oil filter replacement.

May 05, 2011 | 1999 Volkswagen Passat

1 Answer

I have oil in the coolant of my 1999 VW Passat 1800 sport, engine code APT. Although on the face of things it looks to be a head gasket failure, I have been told that it may well be an oil cooler issue....


The oil cooler is almost definatly the problem

The reason for this is.

Your oil pressure is normaly anywhere between 2 and 5 Bar depending on engine temp and oil type, where your water pressure is never more than 1.2 bar. Thus the oil pushes into the cooling system due to the fact that it is of higher pressure.

In the event of a head gasket leaking it will push water into the oil not the other way round causing the oil to eventually go white.

These cars are known to have problems with their oil coolers from time to time.

Feb 14, 2011 | 1999 Volkswagen Passat

1 Answer

I have a 2001 VW Passat I wish to flush the radiator system out but dont know how to drain the system


So far since VW started using phosphate free coolant (pink or red), I haven't seen the need to flush it. This depends whether it was mixed with tap water or other coolant. Anyway, there is a drain valve at the bottom left side of the radiator along the lower hose. Just turn it lefty lucy. Just make sure it isn't hot and pressurized or it will scald you, so open the reservoir cap first before you attempt on opening the valve.

NOTE: Make sure you use only VW G12 coolant and if you need to mix water, the best is filtered drinking water (reverse osmosis), not bottled but something like Brita.

Pls. rate this suggestion, thank you.

Jul 24, 2010 | 2001 Volkswagen Passat

3 Answers

Oil in coolant.had head gasket done.but the problems still ther


either you havent flushed the cooling system out properly ,or the oil cooler has packed up ,their is a oil cooler radiator of sorts that the oil filter screws onto ,these often leak ,just remove the water pipes and join them together with a small piece of copper pipe ,then if you see oil coming out of the water pipes fit a new cooler

May 02, 2010 | 2001 Volkswagen Passat

1 Answer

My car is a volkswagen passat diesel .there is oil in the coolant i was first told the head gasket had blowen. i have also been told it could be the oil cooler. the car is not over heating in fact the...


There is a very easy way to check the oil cooler for leaks.

Do this with the engine cool and be prepared to catch some coolant in a pan.

Remove the 2 coolant hoses from the oil cooler and attach them together using a 5/8 inch straight heater hose connector. You are bypassing the oil cooler temporarily. Wipe the oil cooler clean so you can clearly see any leaks develop.

Now run the engine and watch the oil cooler pipes (the ones you just removed the hoses from) carefully. If you begin to see oil seeping from the cooler pipes you've found your problem.

This might take a while to see so be patient and let the car run for at least 15 mins or more.

Don't worry about the cooler being disconnected while the car is running, but I do recommend reconnecting the cooler if you have to drive it even if you find it to be leaking.

If it is found to be leaking, you will need to replace the part and have your coolant flushed out properly to remove as much of the oil as possible from the system. Also change the engine oil at the same time, it is possible that coolant has gotten into the oil although it may not be obvious.

Good luck.

Jan 31, 2010 | 2001 Volkswagen Passat

1 Answer

I have a 2001 passat 1.8 liter turbo. I thinkthat i have a coolant leak or something more major. It keeps sucking down coolant only when i go for more than 5 or so miles. Otherwise is fine


let your engine sit overnite.then check your oil.if it seems like a coffee milk shake,youve blown a head gasket.if not it could be a simple hose leak,also test your radiator pressure cap when they get weak they let the coolant go by.? is it runnin hotter than normal?

Nov 24, 2009 | 2001 Volkswagen Passat

3 Answers

05 vw caddy. oil is leaking into coolant


This sounds like the oil cooler is faulty .you will need to replace this and then wash out collant system

Jun 26, 2009 | 2001 Volkswagen new Passat

3 Answers

Oil in water resovour vw 2002 passat


Could be just the OIL COOLER. VW IS CORRECT.
If the oil cooloer fails internely you will have a mix of coolant and oil. In the engine and in the Radiator,

But not to say the other guys were wrong...

May 27, 2009 | 2003 Volkswagen Passat

3 Answers

Oil in water resovour vw 2002 passat


This is probably a head gasket problem and not an oil cooler problem.

The oil cooler is fairly easy to test.

Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.

You may also be able to bypass the oil cooler altogether if it leaks.

The head gasket is another story.

Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.

Then you can charge the cylinders with air from your compressor.

Make sure each cylinder that you test is at top dead center so that the valves are closed.

If air bubbles into your coolant, you found your problem.

If air leaks out your intake you have a bad intake valve

If air leaks out your exhaust you have a bad exhaust valve etc.


If you find this useful, please take the time to rate it.

Tim

Apr 15, 2009 | Volkswagen Passat Cars & Trucks

1 Answer

2001 VW Passat leakin water


I would highly suggest a pressure test to really pin point this leak. I can tell from diagram that the coolant expansion tank line goes right thru that area. I would also caution you to the obvious with this vehicle- everything is a tight fit and coolant leaking from the t-stat housing and or water pump could look similiar. I strongly suggest a pressure test to keep from throwing good money away.

Nov 04, 2008 | 2001 Volkswagen Passat

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